MaCaulé was probably MacCauley or some similar Scottish name. Such spelling corruptions are not uncommon and anyone tracing their Scottish ancrestry in Québec should always check for such French phonetical spellings.
Seigneuries were land grants made to Orders of the Catholic Church, members of the aristocracy, military officers, etc., on the condition that they construct a flour a mill, clear some of the land, establish settlers and sell them parts of the land. The holder of the land-grant was called a Seigneur. When the word Seigneur is used in relation to land-grants in New France, the literal translation of the word as Lord is not appropriate. The University of Wisconsin Press in 1966 published a study of The Seigneurial System in Early Canada by R. C. Harris.